All types of valves are with few exceptions operated by a link motion, generally of the Stephenson type, occasionally of the Allan type or the Gooch type, or with some form of radial gear as the Joy gear or the Walschaert gear, though the latter gear has characteristics which ally it with the link motions.
C. Gooch, which has come into common use in quantitative analysis where the solid matter has to be submitted to heating or ignition, consists of a crucible having a perforated bottom.
Hawley employs sodium thiostannate which precipitates thallium as T1 2 SnS 4, insoluble in water, and which may be dried on a Gooch filter at 105°.
In the meantime the Presbyterians, who had been officially recognized in Virginia under the Toleration Act in 1699, and had been guaranteed religious autonomy in the Valley by Governor Gooch in 1738, had sent missionaries into the border counties of eastern Virginia.
William Gooch, Lieutenant Governor..
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